Introducing Plasti-Paste, the innovative two-component fiber resin designed for vertical surface application from Smooth-On. This exceptional product consists of a liquid (Part A) and a paste (Part B), which when mixed together, form a strong, durable, and lightweight plastic. With a 1:3 mix ratio by volume (41:100 by weight), Plasti-Paste is perfect for a variety of applications, including creating mother molds and support shells that reinforce the shape of rubber molds during casting.

The unique properties of Plasti-Paste make it an ideal choice for many projects. It has no odor, and its pot life is around 8-10 minutes, depending on the mass. Once mixed and applied, it cures to form a strong, durable, and lightweight plastic that can be handled in about 90 minutes. This remarkable product holds its shape perfectly, even on vertical surfaces, and can be pigmented with So-Strong color tints for added customization.

In addition to its impressive performance, Plasti-Paste is also easy to work with. It can be mixed in a well-ventilated area, and safety precautions such as wearing gloves, safety glasses, and long sleeves minimize the risk of contamination. A small test application is recommended to determine the product's suitability for your specific project.

To ensure successful demolding, it's essential to apply a release agent to the surface. Sonite Wax, followed by a coating of Universal Mold Release or Ease Release 200, does the job perfectly. Additionally, applying aluminum foil as a barrier over the surface, followed by a mold release agent, prevents adhesion and ensures easy demolding.

When working with Plasti-Paste, it's crucial to follow the recommended mixing and application procedures. Part B, the paste, requires pre-mixing to redisperse the oil and paste components, which may have separated. The mix ratio is 1A:3B by volume (41A:100B by weight), and the mixed material should be applied immediately to the surface. To increase working time, spread the entire container contents over the rubber mold surface and cover and spread the mixture to uncovered areas.

Once applied, the material will thicken quickly, and its pot life is limited. Therefore, it's essential to apply the mixed material uniformly with a spatula over the mold surface. A thickness of at least 3/8" (1 cm) is recommended, but for maximum strength and heat resistance, a thickness of 1/2" (1.27 cm) is ideal.

After curing, the plastic will be hot, so it's essential to let it cool to room temperature before handling. The material will develop handling strength and can be handled in about 90 minutes, depending on the mass. Fully cured plastic with a minimum thickness of 1/2" (1.27 cm) will resist temperatures up to 130°F/55°C. If machining or sanding cured plastic, it's crucial to wear a NIOSH-approved mask to prevent inhalation of residual particles.

Overall, Plasti-Paste is an exceptional product that offers unparalleled performance, durability, and versatility. Its unique properties, ease of use, and versatility make it an ideal choice for a wide range of applications. Whether you're a professional or a hobbyist, Smooth-On's Plasti-Paste is an excellent addition to your toolkit.